Research notes on every problem, and a library of the papers behind them. Built from the open erdos repository.
Updated
Claim. , where
is the largest clique transversal number of
a graph on vertices, so both displayed questions of
Problem 610 have the answer
yes. The claim was posted on the site's discussion thread on 21 April 2026
by the account Przemek Chojecki, with a four-page note, A note on
the clique-transversal number, dated 21 April 2026 and naming no author in
its text, and a Lean file erdos610.lean; the post credits the note to an
AI system (GPT-5.4 Pro) and the Lean file to another (Aristotle).
What the postings contain. The note states
the theorem, proves the transfer from a clique coloring to a clique
transversal through the complement of a largest color class (its Lemma 2) and
the triangle-free equality (its Lemma 5), and quotes
Corollary 2 of Joret, Micek, Reed and Smid and Kim's Theorem 1.1 as its
Theorems 3 and 6 without proof; its Remark 8 says that the argument does not
settle the Erdős--Gallai--Tuza conjecture of
Problem 151. The Lean file
(336 lines, import Mathlib) defines
maximal cliques, clique transversals and clique colorings, proves the
transfer and the triangle-free equivalences, declares jmrs_theorem and
kim_theorem with sorry under a docstring saying their proofs are beyond
the file's scope, and proves upper_bound, lower_bound and main_theorem
from them. It is a kernel-checkable derivation of the statement from two
unproved inputs, not a proof of the statement; the corpus holds no build of
it.
Standing. The claim is claimed. The site adopted the label PROVED
(LEAN) after the post (the page's line of additional thanks names the
poster, while its commentary credits Joret, Micek, Reed and Smid; the
community database lists that status as of its record's last update of
7 June 2026), which records the site's adoption of this route; the note is unrefereed, its Lean
file proves nothing about the two inputs, and two thread posts of 18 May and
17 July 2026 say the formalization essentially assumes what it needs to prove
and that the site should not call the problem proved in Lean. The
mathematics the note assembles is that of the accepted claim
Joret--Micek--Reed--Smid,
which carries the problem's standing; the 26 August 2026 gap claim against
that paper's Theorem 1, recorded there, bears on this claim equally.
Depends on. Joret--Micek--Reed--Smid, whose corollary supplies the upper bound; the lower bound is Kim's theorem, a library result cited on that page.